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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f48ac7d5e4e785612509b52a7fde5519fe022cbdfb5ae63f6fd9948f8634c7ef' 
  AND token = 'x1ITInSRnjmgjwr1gRreEy3v+KXy4utyJdIl3orf91c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}